His puzzle has 1539 pieces and measures a foot wide. Although he can solve a regular 3×3x3 cube in about two minutes, Oskar admits his cube has him beaten.

He says: “The puzzle has never been solved, although people have solved virtual versions of it on the internet. If you can solve a regular Rubik’s cube you could work out how to solve my version but it would take a lot of work. It’s quite nice to make pictures from all the colours on the cube.”

He adds: “I’ve been designing puzzles since I was about 12 and I thought it would be nice to go over the top and build an even larger Rubik’s cube. I presented the puzzle at the New York Puzzle Party Symposium this month and the crowd went wild – everybody wanted to touch and try ‘I won’t be making a bigger one in the future but in theory someone could take my design and use it to make something larger.”